WHY DO MY IPHONE TAKE A VIDEO WHILE TAKING A PHOTO
WHEN TAKING A PHOTO - MY I-PHONE 10 NOT ONLY TAKE THE PHOTO BUT ALSO A VIDEO OF SAME SUBJECT - HOW DO I GET IT TO STOP? -
iPhone X
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See the information in Take and edit Live Photos - Apple Support
To turn it off, see the following from that link:
How to turn off Live Photos
Tap the Live Photos button 
to turn off Live Photos. A slash through the Live Photos button means the feature is off.
The Camera app turns Live Photos on again automatically. To keep Live Photos off permanently, follow these steps:
- Open the Settings app.
- Tap Camera > Preserve Settings.
- Make sure that the switch next to Live Photos is turned on.